If you are a little careful, I think you can _____the problem.

--Does the bookstore         math books?--Yes. Do you want to          one?

My grandfather was badly ill, so we asked him _________ smoking.

I can’t do the work by myself so I ________ a student to help me.

A big party was held in NO.18 Middle School last night, the teacher with students _____ singing and dancing happily at the party.